#include<stdio.h>

int main()
{
	int day  = 4;
	int peach = 1;
	int i;

	for(i=1;i<4;i++){
		peach = (peach+1)*2;
	}
	printf("猴子第一天买了%d个桃子！\n", peach);

	return 0;
}
